I'm planning out the conical and parts that I would like to get and I'm trying to decide between valves. I like the butterfly valves (obviously), but one thing I'm not sure about is how easy it is to take a small sample for gravity reading from a 1" butterfly valve in the side of a 15gal conical. I know you can slowly open a ball valve and let out just a trickle, but a butterfly seems like it might open faster. Never having used one, I'm seeking advice from those with butterfly valve experience. Your wisdom is appreciated